Soot-cleaning apparatus for water-tube and similar boilers



A. wEsTERax-:RG E1- AL SOOT CLEANING APPARATUS FOR WATER TUBE AND SIMILAR BOILERS Filed June 21 1923 2 Sheets-Sheei 1 Ll '//l l/// A .Z'zm/eniorsI J'UJQ Weel'bez'g 'Tf/Lure logzcnd wmf@ TQM Dec. 28 .1926.

AA. WESTERBERG ET AL SOOI` CLEANING APPARATUS FOR WATER TUBE AND SIMILAR BOILERS Z azz/d Til/ure Patented Dec. 28, 1926..

ABVID'WESTERBERG AND THURE HGLUND, OF STOCKHOLM, SWEDEN, ASSIGNORS TO AKTIEBOLAGET SUPERIOR, OF STOCKHOLM, SWEDEN, A CORPORATION.

A i y 1,612,334 PATENT erica.

SCOT-CLEANING APPARATUS FOR WATER-TUBE AND SIMILAR BOILERS.

Application led June 21,

This invention relates to soot cleaning apparatuses for water tube and similar boilers of the type comprising a rotatable blow pipe disposed at right angles to the longitudinal direction of the water tubes and having a number of nozzles arranged so as to discharge the cleaning steam at an oblique angle to the axis ofrotation of the blow pipe and diagonally into the spaces between the said water tubes.

On rotation of an ordinary blow pipe of said type thesteam jet issuing from the obliquely directed nozzlesdescribes a circular, outwardly spreading path around the axis of rotation of said pipe, and, if in a certain position of said rotatably, mounted blow pipe the steam jet or the main part thereof will really penetrate diagonally into the spaces between the water tubes without striking other tubes than those belonging to the row of tubes most remote from the nozzle, the steam jet will in another angular position of the rotary blow pipe also hit water tubes located at a less distance from the nozzle. The part or parts of the steam jet striking thel last mentioned tubes will thus be deflected and linterfere with the momentarily active part of the steam jet proceeding directly through the diagonal 30 space between the Water tubes, thereby considerably reducing the cleaning effect of the last mentioned part of the steam jet and-- thus theacti'vity of the whole apparatus.

The main object of the present invention is to avoid the said drawback, i. e. to provide for that a main part of the steam jet will penetrate intb the space between the water tubes-at` anyi angular position of the blow pipe Without being interrupted by the part or arts of the steam jet which are deflected. ith the above and other objects in view,` the invention Consists essentially in this that the outlet openings of the nozzles have such a form as to impart a fan-shape to the issuing steam jet and such a direction that the plane indicating the main extension of said fan-shaped steam jet forms an angle other than 0 with theaxis of rotation of the blow pipe. By such means that part of the steam Jet, which strikes a water tube will he deectedinto a plane other than that containing the momentarily active part of the steam get and thus will not interfere with said atter part.

The invention consists further of the novel 1923. Serial No. 646,880.

construction and arrangement of parts as. will be hereinafter more particularly described, and then claimed, and in describing the invention in detail, reference will be had to the accompanying drawings-illustrating a preferred embodiment thereof. f

Fig. 1 is a longitudinal section of awater tube boiler provided with a soot cleaningv apparatus according to the invention. Fig. 2 is an axialsection through the rotary 'blow pipes on an enlarged scale.V Fig. 3 isa crosssection of a blow pipe on .a still enlarged scale showing the special arrangement of 'the d nozzle. Fig. 3ftv is an axial section thereof, showing also a projectiony of the end surface of the nozzle. Fig. 3b `is an end view of a. somewhat modified nozzle. Fig. 4 is a crosssecton along line 4-4 of F ig. 2 on an enlarged scale. Fig. 5 shows details of the eferring particularly to Figs. 1 and 2, 1 designates the water tubes to be cleaned and 10 a number of blow pipes disposed at right angles to the longitudinal direction of said water tubes. Each of said blow pipes 10 is provided with a number of nozzles 2v having outlets arranged so as to discharge the'steam' at' an oblique angle to the axis of rotation of the blow-pipe and diagonally into the spaces between the water tubes, as. apparent from Fig. 2. The blow pipes 10 are rotatably mounted on the water tubes 1 by means of specially devised straps 9 and are rotated by means of sprocket-wheels 12, secured to the outer free ends of the blow pipes. and chains 13 running over said sprocket-wheels, as apparent from Fig. 1.

As shown in Figs. 3 and 3, the inlet opening 14 of each nozzle 2 is comparatively small and of a substantially circular crosssection. On the other hand, the outlet opening 15 of the nozzle is elongated so as to impart a fan shape to the steam"et issuing forth. The longitudinal axis o the said outlet opening 15 (line E-E of Fig. 3*) is inclined to the plane G-G determined by the anis of rotatlon of the blow pipe 10 and by thecentre of the inlet opening 14 of thev v nozzle, so that the plane indicating the main direction of the fan-sha ed steam jet will 105 form an angle with sait axis of rotation.

It will also be seen from Fig. 3 that the outlet opening of the steam nozzle is unsymmetrical to the plane G-G and, likewlse, unsyxnmetrical to any other plane determined o l by the said axis of rotation. As further apparent from Fig. 3 the outlet opening 15 is somewhat wider at the centre than at the ends.

W'hen the main direction' of the steam jet is such as to be directed toward the diagonally opposed corner of that compartment of the boiler wherein the apparatus in question is situated, obviously .the steam .jet will have to travel 'a longer distance, in,.order to hit the remotest water tubes, than when the main direction is at right angles to the water tubes. aTherefore, it is necessary to 'of which is larger at the one end than at the other. Such an embodiment islshown in Fig..3?, the outlet opening 15 being in this case defined by two circulanarcs (at the ends) united bytwo straight lines.

In Fig. 4, representing a cross section on an enlarged scale along the line 4 4 of Fig. 2, 10 designates the rotary blow pipe having a vsteam supply opening 17. 11 is a fixed casing, to the lower screw-threaded part 19 of which .the steam piping-2 0, Fig.

5, is to be connected. When the rotary pipeV 10 is so displaced as to cause the opening 17 to be ldirected upwardly, the steam supply will be cut off from the movable part. In they same figure the position. of la steam nozzle 2 isishown by dotted lines.

The said cut-off means permit of an independent operation of each blow pipe per se. Therefore, it is not necessary to -install 'more than one particular steam valve `21,

Fig. 5, forthe whole plant of a boiler. The last-mentioned figure shows the pipe system -for a'boiler. 22 is the main steam pipe, and

l0 are the blow pipes. 30 is the connecting pipe, and 31 is a drain cock. y

What we claim as new and desire to secure byLetters Patent ofthe United States 1s:- i

1. The combination of a water tube boiltures.

er 'and a cleaning apparatus therefor, said apparatus comprising a rotary blow pipe disposed substantially at right angles to the longitudinal axis'of the boiler tubes and having nozzles for discharging the clean- 2. The combination of a water tube boiler and a cleaning apparatus therefor, said apparatus comprising a rotary blow pipedisposed substantiallyat right angles, to the longitudinal axis of the boiler tubes and having nozzles for discharging the Acleaning fluid diagonally into the adjacent spaces between the water tubes, the outlet opening of'each nozzle being unsymmetrical with relation to .any plane coinciding with the axis ofthe blow pipe and having such a form as to ,impart a fan-shape to the steam jet isssuing therefron'i, and so arranged as to cause the jet' to travel in a plane oblique in two directionsto the axes ofthe boiler tubes.

p 3. The combination of a water-tube boiler and a cleaning apparatus therefor,.said apparatus comprising a rotary blow pipe disposed substantially at right angles to the longitudinal axis of the boiler tubes and having nozzles for discharging the cleaning fluid diagonally into the adjacent spaces between the` water tubes, thel outlet opening of` eachy nozzle vhaving such a form as to vimpart a fan-shape, tothe steam jet issuing therefrom, and so arranged as to cause the jet to travel in a plane oblique in two directions 'to the axes ofthe boiler tubes, said blow pipe having a 'steam-supply opening at the proximity of the one end and being seated at the said end in a fixed casing, to

ywhich steam is supplied, said casing bearing tightly against part of the circumference of the blow pipe so as to cut off the steam supply to thesaid opening of the blow pipe, when said pipe occupies certain angular positions.

In .testimony whereof we alix our signa- 'rHURE HGLUND. ARVID WESTERBERG.l 

